wolfSSL - Embedded SSL Library — Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

Re: Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (dgarske) — Thu, 09 Jun 2022 20:41:51 +0000

Hi lili,

Make sure you have the wolfcrypt/src/kdf.c file included. Make sure you have `WOLFSSL_HAVE_PRF` defined.
Are you using the latest wolfSSL v5.3.0 Cube pack?

Thanks,
David Garske, wolfSSL

Re: Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (lili) — Wed, 08 Jun 2022 10:24:27 +0000

These errors are related to

undefined reference to `wc_PRF_TLS' STM32L4A6 line 0, external location:

undefined reference to `wc_PRF_TLS' tls.c /STM32L4A6/Middlewares/wolfSSL/wolfSSL/wolfSSL/Core C/C++ Problem

Thanks in advance

Re: Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (lili) — Wed, 08 Jun 2022 10:13:50 +0000

Thanks for you help.

this problem is solved. but I confront with these errors now:

./Middlewares/wolfSSL/wolfSSL/wolfSSL/Core/tls.o: in function `BuildTlsFinished': STM32L4A6 C/C++ Problem
./Middlewares/wolfSSL/wolfSSL/wolfSSL/Core/tls.o: in function `DeriveTlsKeys': STM32L4A6 C/C++ Problem
....
./Middlewares/wolfSSL/wolfSSL/wolfSSL/Core/tls13.o: in function `DeriveEarlySecret':
...

Do you have any ideas?

Re: Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (dgarske) — Tue, 07 Jun 2022 16:54:45 +0000

Hi lili,

It is "-fomit-frame-pointer" added to the CFLAGS that you can use in debug mode to resolve this.

Thanks,
David Garske, wolfSSL

Re: Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (dgarske) — Tue, 07 Jun 2022 12:26:20 +0000

Hi lili,

This happens only in debug mode. In release mode this goes away. This is due to the use of R7 I believe. There is a cflag that can be used to workaround this like -frame-omit-pointer, but I cannot find my note on that right now.

Another option is to use math option 3 in debug and math option 4 (asm) in release. The asm does increase math performance multiple x.

Thanks,
David Garske, wolfSSL

Type 'asm' operand has impossible c in WOLFSSL example with STM32CuIDE

null@example.com (lili) — Tue, 07 Jun 2022 09:54:04 +0000

Hi all,
I tried to run one example from I-CUBE-wolfSSL example.
My compiler is STM32CubeIDE.
I have three errors:

1- 'asm' operand has impossible constraints sp_cortexm.c /STM32L475/Middlewares/wolfSSL/wolfSSL/wolfCrypt/Core line 15344 C/C++ Problem

2- make: *** [Middlewares/wolfSSL/wolfSSL/wolfCrypt/Core/subdir.mk:403: Middlewares/wolfSSL/wolfSSL/wolfCrypt/Core/sp_cortexm.o] Error 1 STM32L475 C/C++ Problem

3- make: *** Waiting for unfinished jobs.... STM32L475 C/C++ Problem

how can i solve these errors?

Regards